Physics-Motion and Gravity Help

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Homework Help Overview

The discussion revolves around a physics problem related to motion and gravity, specifically involving projectile motion. The original poster seeks assistance in determining the required velocity for a baseball to travel a distance of 90 meters when hit at a 40º angle, with a flight time of 3.9 seconds.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the concepts involved in projectile motion and the equations typically used to solve such problems. There is an exploration of the need to find the initial velocity and the confusion surrounding the application of known equations.

Discussion Status

The discussion is ongoing, with participants providing guidance on relevant equations and concepts. Some participants express confusion about how to apply the angle of impact and the flight time to find the initial velocity. There is acknowledgment of the need to consider both horizontal and vertical components of motion.

Contextual Notes

Participants note the lack of clear instructions in the exercise book and the absence of a physics teacher for additional support. The original poster expresses uncertainty about the problem setup and the equations needed to solve it.

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Physics--Motion and Gravity... Help!

Homework Statement





I have this really great exercise book that gives you excercises with no explanation how to do it. The question is: For a baseball to travel 90m, with what velocity must it be hit if the angle of impact is 40º? The flight time is 3.9 sec. I have absolutely no idea how to start solving this!

Homework Equations





The Attempt at a Solution

 
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lilaSA said:
I have this really great exercise book that gives you excercises with no explanation how to do it. The question is: For a baseball to travel 90m, with what velocity must it be hit if the angle of impact is 40º? The flight time is 3.9 sec. I have absolutely no idea how to start solving this!
Welcome to PF lilaSA,

You must have some idea as to where to start, which concepts are involved?
 


What do you mean concepts? The majority of the excercises require you to solve problems in connection with the height or speed of objects, but normally they give the velocity at which it travels. I'm quite confused
 


What equations do you normally use to solve those problems? They can be used to solve this one, except this time you will be finding the initial velocity.
 


The equations they use to solve velocity is normally change in distance/change in time... I've tried that, but the answer is still incorrect. I have also tried solving it by using the gravity measurement thingy and working it into the equations, but that didn't work either. My physics teacher moved, now I'm stuck lol
 


There is another equation I just found, it is: velocity = gravity x time... Does that help?
 


OK thanks... I've gone to the link, but I still need to solve the problem using the degrees? I'm sorry, I'm quite clueless with these things
 


I think I get it now, thanks so much!
 

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